I also really want to know what the LDAP Search base needs to be as I have tried using this before and gave up at this spot, I'd also like to know if it's possible to keep the same user passwords with the migration wizard....

Migrating Accounts

The Account Migration tool opens the Provisioning tasks tab with the link to the Migration Wizard. The wizard guides you through importing data from another server. Users' email messages, calendars, contacts, and task lists from an existing Microsoft Exchange server can be moved to ZCS. When user files are migrated, the folder hierarchy is maintained.

and get what your old zimbra server called the bind DN. For me, their default was correct. Default LDAP filter worked for me too.

For the password you can use

zmlocalconfig -s zimbra_ldap_password

to get your server's value.

Sadly, the accounts seem to come through fine, but of course it's not a direct dump/upload. You end up provisioning accounts with the system and then playing with trying to get the rest of the account to sync over.